如何行转换成列

Question

我从XML生成一个临时表的SQL服务器，它具有以下结构

column1 column2 
    id   1234 
    code  ukjk 
    . 
    . 
     there will be another 60 rows again 
    id   4586 
    code  ouiu 
    . 
    . 
     there will be another 60 rows again 
    id   78545 
    code   khdsjf 

    like this there will be 15 id's in the table 

现在我想将行转换成列状

我不不想全部60我只需要5人

 id code vdb_id guid .... 
     1234 
     4586 
     78545 

和我也有附加的XML文件图像..

我已经使用旋转功能

IF OBJECT_ID('tempdb..#xml_final') IS NOT NULL DROP TABLE #xml_final 
    CREATE TABLE #xml_final (rownum int, Project_id int, Project_Name varchar(60),  Project_manager_id int, Updated_date varchar(60)) 

    insert into #xml_final 
    SELECT * FROM 

    (

     SELECT xmlData.Result.value('v[1]','VARCHAR(200)') AS A, 
     xmlData.Result.value('n[1]','VARCHAR(200)') AS B, 
    ROW_NUMBER() over(PARTITION BY xmlData.Result.value('n[1]','VARCHAR(200)') 
      order by xmlData.Result.value('v[1]','VARCHAR(200)')) AS Num 
    FROM @xmlData.nodes('//result/rows/row/f') xmlData(Result) 

) AS A 
    Pivot (Min(A) FOR B IN ([id] , 
        [summary], 
        [manager_id], 
        [ts] 
        ) 
    ) piv  

但它不能正常工作..我越来越不匹配错误

例如

 id 1234 i am getting code as ouiu 

输出2表将有3列

row_num key2 item_value 
     1 id  1234 
     5 proj_id  7655 
     9 task_name kfhkjfdhg 
     21 id   5455 
     25 proj_id  6789797 
     29 task_name dsyhuiyfhdi 

和key2将只包含这3列名称

输出我想有是，

id  proj_id task_name 

    1234  7655  kfhkjfdhg 
    5455 6789797 dsyhuiyfhdi 



    DECLARE @cols AS NVARCHAR(MAX), 
     @query AS NVARCHAR(MAX) 

    select @cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(key2) 
       from #output_2 
       group by key2, row_num 
       order by row_num 
     FOR XML PATH(''), TYPE 
     ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'') 

    set @query = N'SELECT ' + @cols + N' from 
     (
      select item_value, key2 
      from #output_2 
     ) x 
     pivot 
     (
      max(item_value) 
      for key2 in (' + @cols + N') 
     ) p ' 

    print @query 
    exec sp_executesql @query; 

更新查询

 DECLARE @columns VARCHAR(max)='', 
    @sql  NVARCHAR(max) 

    SELECT @columns += COL 
     FROM (SELECT DISTINCT '[' + Isnull(key2, '') + '],' col 
    FROM #output_2 
    WHERE item_value IS NOT NULL) a 

    SELECT @columns = LEFT(@columns, Len(@columns) - 1) 


     SET @sql ='SELECT rownum,' + @columns + ' 
     FROM (SELECT Row_number()OVER(PARTITION BY key2 ORDER BY item_value) rownum, 
       * 
     FROM #output_2)a 
     PIVOT(Max(item_value) 
      FOR key2 IN(' + @columns + ')) piv ' 

      Print @sql 

     EXEC Sp_executesql @sql 

更新问题2：

 IF OBJECT_ID('tempdb..#output_3') IS NOT NULL DROP TABLE #output_3 
     CREATE TABLE #output_3 ( row_id int, row_num int , task_id int, project_id int, task_name varchar(200)) 

    insert into #output_3 
    SELECT Row_number() over (ORDER BY (select null)) row_id , rownum,(id),(project_id),(summary) 
     FROM (SELECT Row_number()OVER(PARTITION BY key2 ORDER BY (select null))  rownum, 
       * 
     FROM #output_2)a 
     PIVOT(Max(item_value) 
      FOR key2 IN([id],[project_id],[summary])) piv 


     select row_id, task_id, task_name, project_id from #output_3 

输出：

插入查询

 IF OBJECT_ID('tempdb..#output') IS NOT NULL DROP TABLE #output 
    CREATE TABLE #output (id int ,key2 varchar(50), item_value varchar(200)) 

    insert into #output 
     select 
    ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) as SNumber, 
    key2 = Item2.value('(n)[1]','varchar(50)'), 
    ItemValue = Item2.value('(v)[1]','varchar(50)') 
     from 
     @xmlData.nodes('/result/rows') as T(Item) 
    cross apply 
    item.nodes('row/f') as T2(Item2) 

如何来解决这个问题..

how can i read multiple xml values from URL through t-sql

Answer 1

试试这个。改变你的Pivot Query这样

create table #output(key2 varchar(50),item_value varchar(50)) 

insert #output 
values 
('id','1234'),('code','ukjk'),('GUID','DFG'), 
('SRC',null),('TS',null),('workspcd','3245'), 
('id','4586'),('code','ouiu'),('GUID','ff'), 
('SRC',null),('TS',null),('workspcd','2233'), 
('id','78545'),('code','khdsdf'),('GUID','dffff'), 
('SRC',null),('TS',null),('workspcd','3234') 

SELECT rownum,[id],[code],[GUID],[workspcd] 
FROM (SELECT Row_number()OVER(PARTITION BY key2 ORDER BY item_value) rownum, 
       * 
     FROM #output)a 
     PIVOT(Max(item_value) 
      FOR key2 IN([id],[code],[GUID],[SRC],[TS],[workspcd])) piv 

UPDATE：若要动态

DECLARE @columns VARCHAR(max)='', 
     @sql  NVARCHAR(max) 

SELECT @columns += COL 
FROM (SELECT DISTINCT '[' + Isnull(key2, '') + '],' col 
     FROM #output 
     WHERE item_value IS NOT NULL) a 

SELECT @columns = LEFT(@columns, Len(@columns) - 1) 

SET @sql ='SELECT rownum,' + @columns + ' 
    FROM (SELECT Row_number()OVER(PARTITION BY key2 ORDER BY item_value) rownum, 
        * 
      FROM #output)a 
      PIVOT(Max(item_value) 
       FOR key2 IN(' + @columns + ')) piv ' 

EXEC Sp_executesql @sql 

OUTPUT：

rownum id  code GUID workspcd 
------ ---- ------ ----- -------- 
1  1234 khdsdf dffff 2233 
2  4586 ouiu DFG  3234 
3  78545 ukjk ff  3245 

更新删除NULL值

SELECT Row_number() 
     OVER (
      ORDER BY (SELECT NULL)) row_id, 
     rownum, 
     Max(id)      id, 
     Max(project_id)    project_id, 
     Max(summary)    summary 
FROM (SELECT Row_number() 
       OVER(
        PARTITION BY key2 
        ORDER BY (SELECT NULL)) rownum, 
       * 
     FROM #output_2)a 
     PIVOT(Max(item_value) 
      FOR key2 IN([id], 
         [project_id], 
         [summary])) piv 
GROUP BY rownum